DIRECT FABRICATION ON THE POLYMER SURFACES BY USING PRECISION TOOLING MACHINE AND CHARACTERIZATION OF HYDROPHOBICITY AT VARIOUS ROUGH SURFACES

摘要

This report described the hydrophobicity of polymer surfaces, PMMA and polycarbonate. Micro-sized pillar type structures were prepared by the precision machine which could precisely fabricate the various rough surfaces on the polymer surfaces. We considered the geometric parameters, x/d and z/x, to find the factors affect of wettability. The volume of water droplet intruded in pillar spacing affected to increase the hysteresis. Furthermore, the air-pocket formed in solid vapor contact line was attributed to reduce the hysteresis. We also demonstrated the effect of the surface defect through the ductile polymer, polycarbonate. The polycarbonate surfaces showed higher sliding angle than PMMA, which caused the surface defect pinning with water droplet.